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Ohm's Law:
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Ohm's Law is a fundamental principle in electrical engineering that describes the relationship between voltage (V), current (I), and resistance (R) in an electrical circuit. It states that the voltage across a conductor is directly proportional to the current flowing through it, with the constant of proportionality being the resistance.
The calculator uses Ohm's Law equation:
Where:
Explanation: This simple equation allows you to calculate any one of the three values if you know the other two. It's the foundation of circuit analysis.
Details: Accurate voltage calculation is crucial for designing electrical circuits, troubleshooting electrical problems, selecting appropriate components, and ensuring electrical safety in various applications.
Tips: Enter current in amperes (A) and resistance in ohms (Ω). Both values must be positive numbers. The calculator will compute the voltage across the resistor.
Q1: Can Ohm's Law be applied to all electrical components?
A: Ohm's Law applies to resistive components, but not to all electronic components. Components like diodes and transistors have non-linear characteristics.
Q2: What are typical voltage values in circuits?
A: Voltage values vary widely depending on the application, from millivolts in sensitive electronics to hundreds of volts in power systems.
Q3: How does temperature affect resistance?
A: For most conductors, resistance increases with temperature. Some materials like semiconductors have negative temperature coefficients.
Q4: What is the difference between AC and DC voltage?
A: DC voltage is constant over time, while AC voltage changes direction periodically. Ohm's Law applies to both, but additional considerations are needed for AC circuits.
Q5: Can I calculate power using Ohm's Law?
A: Yes, power (P) can be calculated as P = V × I, or by substituting Ohm's Law: P = I² × R or P = V² / R.